{"product_id":"rca-77-dx-9000-vintage","title":"RCA 77-DX #9000 (Vintage)","description":"Very nice example of this classic. Great on horns, guitars, vocals. Rich Lows. Silky smooth mids and highs. A must for every collection - from RCA, the inventors of the ribbon mic. \u003cbr\u003e\u003cbr\u003eA ribbon mic works by suspending a thin piece of corrugated aluminum, (the 'ribbon'), between two poles of an Alnico magnet. The compression and rarefaction of air vibrates this ribbon in the magnetic field, which creates voltage changes that are run through an output transformer to the external amplifier of your choice. Like a dynamic mic, a ribbon requires no tubes, batteries or power supply of any kind. In the case of the \u003cspan style=\"font-weight: bold;\"\u003eRCA 77-DX\u003c\/span\u003e, the chassis is built to absorb mechanical shocks, the output transformer is shielded against magnetic fields, and the capsule is resistant to changes in humidity and temperature. \u003cp\u003eThe 77-DX is a high-fidelity ribbon (or \"velocity\") type mic that was originally designed for both television and broadcast studio use. Two different finishes were offered: umber grey for TV (since it was non-reflective), and a satin chrome version for radio broadcast. \u003cspan style=\"mso-spacerun:yes\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003eThe 77-DX was advertised as a ‘polydirectional’ mic; what we would call today a multi-pattern microphone. The various polar patterns were created by using a tube connected to a chamber behind the ribbon. By rotating a shutter to close off portions of this chamber, patterns could be created from N for non-directional (chamber fully closed), U for unidirectional, to B for bi-directional aka figure-eight (chamber fully open). At a specific point on this continuum, a cardioid pattern is created.\u003c\/p\u003e \u003cp\u003e\u003cspan style=\"mso-spacerun:yes\"\u003e\u003c\/span\u003eThe 77-DX has a frequency response from 30 Hz to 20 kHz. It is also possible to attenuate the low-frequencies with a screwdriver-operated switch on the bottom of the mic body, \u003cspan style=\"mso-spacerun:yes\"\u003e\u003c\/span\u003emarked M (for music), V1, and V2 (for voice). \u003cbr\u003e\u003c\/p\u003e\u003c!--[if gte mso 9]\u003e\u003cxml\u003e \u003cw:worddocument\u003e \u003cw:view\u003eNormal\u003c\/w:view\u003e \u003cw:zoom\u003e0\u003c\/w:zoom\u003e \u003cw:trackmoves\u003e\u003c\/w:trackmoves\u003e \u003cw:trackformatting\u003e\u003c\/w:trackformatting\u003e \u003cw:punctuationkerning\u003e\u003c\/w:punctuationkerning\u003e \u003cw:validateagainstschemas\u003e\u003c\/w:validateagainstschemas\u003e \u003cw:saveifxmlinvalid\u003efalse\u003c\/w:saveifxmlinvalid\u003e \u003cw:ignoremixedcontent\u003efalse\u003c\/w:ignoremixedcontent\u003e \u003cw:alwaysshowplaceholdertext\u003efalse\u003c\/w:alwaysshowplaceholdertext\u003e \u003cw:donotpromoteqf\u003e\u003c\/w:donotpromoteqf\u003e 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locked=\"false\" priority=\"63\" semihidden=\"false\" unhidewhenused=\"false\" name=\"Medium Shading 1 Accent 6\"\u003e\u003c\/w:lsdexception\u003e \u003cw:lsdexception locked=\"false\" priority=\"64\" semihidden=\"false\" unhidewhenused=\"false\" name=\"Medium Shading 2 Accent 6\"\u003e\u003c\/w:lsdexception\u003e \u003cw:lsdexception locked=\"false\" priority=\"65\" semihidden=\"false\" unhidewhenused=\"false\" name=\"Medium List 1 Accent 6\"\u003e\u003c\/w:lsdexception\u003e \u003cw:lsdexception locked=\"false\" priority=\"66\" semihidden=\"false\" unhidewhenused=\"false\" name=\"Medium List 2 Accent 6\"\u003e\u003c\/w:lsdexception\u003e \u003cw:lsdexception locked=\"false\" priority=\"67\" semihidden=\"false\" unhidewhenused=\"false\" name=\"Medium Grid 1 Accent 6\"\u003e\u003c\/w:lsdexception\u003e \u003cw:lsdexception locked=\"false\" priority=\"68\" semihidden=\"false\" unhidewhenused=\"false\" name=\"Medium Grid 2 Accent 6\"\u003e\u003c\/w:lsdexception\u003e 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Emphasis\"\u003e\u003c\/w:lsdexception\u003e \u003cw:lsdexception locked=\"false\" priority=\"21\" semihidden=\"false\" unhidewhenused=\"false\" qformat=\"true\" name=\"Intense Emphasis\"\u003e\u003c\/w:lsdexception\u003e \u003cw:lsdexception locked=\"false\" priority=\"31\" semihidden=\"false\" unhidewhenused=\"false\" qformat=\"true\" name=\"Subtle Reference\"\u003e\u003c\/w:lsdexception\u003e \u003cw:lsdexception locked=\"false\" priority=\"32\" semihidden=\"false\" unhidewhenused=\"false\" qformat=\"true\" name=\"Intense Reference\"\u003e\u003c\/w:lsdexception\u003e \u003cw:lsdexception locked=\"false\" priority=\"33\" semihidden=\"false\" unhidewhenused=\"false\" qformat=\"true\" name=\"Book Title\"\u003e\u003c\/w:lsdexception\u003e \u003cw:lsdexception locked=\"false\" priority=\"37\" name=\"Bibliography\"\u003e\u003c\/w:lsdexception\u003e \u003cw:lsdexception locked=\"false\" priority=\"39\" qformat=\"true\" name=\"TOC Heading\"\u003e\u003c\/w:lsdexception\u003e \u003c\/w:latentstyles\u003e \u003c\/xml\u003e\u003c![endif]--\u003e\u003c!--[if gte mso 10]\u003e \u003cstyle\u003e \/* Style Definitions *\/ table.MsoNormalTable \t{mso-style-name:\"Table Normal\"; \tmso-tstyle-rowband-size:0; \tmso-tstyle-colband-size:0; \tmso-style-noshow:yes; \tmso-style-priority:99; \tmso-style-qformat:yes; \tmso-style-parent:\"\"; \tmso-padding-alt:0in 5.4pt 0in 5.4pt; \tmso-para-margin:0in; \tmso-para-margin-bottom:.0001pt; \tmso-pagination:widow-orphan; \tfont-size:11.0pt; \tfont-family:\"Calibri\",\"sans-serif\"; \tmso-ascii-font-family:Calibri; \tmso-ascii-theme-font:minor-latin; \tmso-fareast-font-family:\"Times New Roman\"; \tmso-fareast-theme-font:minor-fareast; \tmso-hansi-font-family:Calibri; \tmso-hansi-theme-font:minor-latin; \tmso-bidi-font-family:\"Times New Roman\"; \tmso-bidi-theme-font:minor-bidi;} \u003c\/style\u003e \u003c![endif]--\u003e \u003cp\u003ethe RCA 77 series, which resembles a large pill of the capsule variety, has become THE iconic shape of a microphone, and remains so over 40 years after it was discontinued in 1967. The 77-DX was used in countless radio and TV studios \u003cspan style=\"mso-spacerun:yes\"\u003e\u003c\/span\u003ein the 50s and 60s. Though rarely seen by the public, its excellent tone was certainly heard by millions, especially in the case of the most famous broadcaster of the period, Edward R. Murrow.\u003c\/p\u003e","brand":"RCA","offers":[{"title":"Default Title","offer_id":44449577959527,"sku":"19352","price":2095.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0658\/8848\/5479\/files\/used_rca_77-dx__9000_cat_1a44ef9c-c60a-401e-9839-3966326b9099.jpg?v=1787089539","url":"https:\/\/vintageking.mom\/products\/rca-77-dx-9000-vintage","provider":"Vintage King","version":"1.0","type":"link"}